Comment Needs more data (Score 1) 23
MTBF is useful information, but I think it would be more useful in conjunction with factors like active spinning time, total spin up/down counts, cumulative head seek time, total IO, etc. Presumably time-in-service affects the MTBF more than the age of the drive, but to what extent? Is a NIB drive that's two years old going to be as reliable as one that's only a month or two old? So many variables....